add function Partition for Model of package gdb

[arieslee]

add Partition method.
Example:
dao.User.Ctx(ctx).Partition（“p1","p2").All()

change set -> sets

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (02f1cc7) 77.37% compared to head (9e9631c) 77.32%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2989      +/-   ##
==========================================
- Coverage   77.37%   77.32%   -0.06%     
==========================================
  Files         645      645              
  Lines       54302    54347      +45     
==========================================
+ Hits        42018    42025       +7     
- Misses      10175    10213      +38     
  Partials     2109     2109              

Flag	Coverage Δ
go-1.18-386	77.38% <66.66%> (-0.01%)	⬇️
go-1.18-amd64	77.38% <66.66%> (-0.05%)	⬇️
go-1.19-386	77.28% <66.66%> (-0.02%)	⬇️
go-1.19-amd64	77.25% <66.66%> (-0.01%)	⬇️
go-1.20-386	77.38% <66.66%> (-0.01%)	⬇️
go-1.20-amd64	77.30% <66.66%> (+0.06%)	⬆️
go-1.21-386	77.31% <66.66%> (-0.12%)	⬇️
go-1.21-amd64	77.36% <66.66%> (-0.05%)	⬇️

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Files	Coverage Δ
database/gdb/gdb_model.go	60.76% <66.66%> (-14.24%)	⬇️

... and 2 files with indirect coverage changes

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